CVE-2017-2625 : What You Need to Know

Researchers discovered a vulnerability in libXdmcp version 1.1.2 or earlier, allowing a local malicious user to exploit weak entropy in session key generation. This could lead to unauthorized access to other users' sessions.

Understanding CVE-2017-2625

This CVE involves a weakness in libXdmcp that could be exploited by a local attacker to gain unauthorized access to user sessions.

What is CVE-2017-2625?

CVE-2017-2625 is a vulnerability found in libXdmcp version 1.1.2 or earlier, where session keys are generated using weak entropy, enabling a malicious local user to perform unauthorized access to other users' sessions.

The Impact of CVE-2017-2625

The vulnerability poses a medium severity risk with high confidentiality impact, allowing unauthorized access to sensitive user sessions on multi-user systems utilizing xdmcp.

Technical Details of CVE-2017-2625

This section provides technical details about the vulnerability.

Vulnerability Description

The vulnerability in libXdmcp version 1.1.2 or earlier allows a local attacker to exploit weak entropy in session key generation, facilitating unauthorized access to other users' sessions.

Affected Systems and Versions

Product: libXdmcp
Vendor: Xorg
Versions Affected: 1.1.2 and earlier

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Scope: Changed
Confidentiality Impact: High
Integrity Impact: None
Availability Impact: None
CVSS Base Score: 6.5 (Medium Severity)
Vector String: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Mitigation and Prevention

Protecting systems from CVE-2017-2625 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security updates provided by the vendor
Monitor and restrict local access to vulnerable systems
Implement strong authentication mechanisms

Long-Term Security Practices

Regularly update and patch software to address vulnerabilities
Conduct security training for users on best practices
Implement network segmentation to limit the impact of potential breaches

Patching and Updates

Refer to vendor advisories for patch information
Stay informed about security updates and apply them promptly